09b propane presentation(kcl)
TRANSCRIPT
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Propane Fuel Systems
Presented by
K
Kubota Engine America and Kubota Canada Ltd
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?
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Characteristics of Propane
Also known as LPG, Liquified PetroleumGas.
LPG is heavier than air.
LPG is a by-product of oil and natural gasrefining.
1USgallon (3.79L) of LPG will create
272USgallons (1030L) of gas.
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Characteristics of Propanecont..
1USgal. (3.79L) of LPG at 24 : 1 ratio will create
1300ft3
(36.8m3
) or 10,000USgal. (37854L) ofcombustible gas.
In its liquid state it will boil at44oF.(-42oC)
LPG ignites between 957oF (514oC) to 1090oF
(588oC). Gasoline ignites at approx. 780oF(416oC).
LPG is a colorless and odorless gas. The odor isadded for safety.
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Propane Safety
LPG is a highly flammable fuelcontainedunder pressure and may cause fires and/or
explosions if improperly used.
LPG in its liquid state (-44
o
F /42
o
C) canfreeze skin.
When possible, turn off the LPG fuel supply
and run the engine until it runs out of fuel.
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Propane Safety
Perform repairs in a well ventilated area. Use only approved fittings and line.
Leak check all fittings, lines, and joints after
repair. Always front seat or back seat the main
supply valve.
Never check for leaks with a flame.
Cont..
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Benefits of Propane
Clean Burning.
Longer Engine Life.
Reduced Emissions.
Higher Octane (112).
Easily Transported and Stored. Non Poisonous.
Will Evaporate quickly if spilled.
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Basic Propane System
Pressure Tank
Shut Off Valve
Filter
Electric Shut Off Valve
Vaporizer Carburetor / Mixer
Engine
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Manual valve
Minimum operating pressure= 0.35Kg/cm
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Propane Vaporizer
Primary Chamber. Liquid fuel is
decompressed and evaporated.
Secondary Chamber. Decompresses gas to
approximately atmospheric pressure.
Water Passage. The engine coolant is used
to supply heat to evaporate the LPG.
Vacuum Lock Chamber. Locks fuel in the
primary chamber when engine is off.
Not Field Serviceable.
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Vaporizer
Secondary Chamber
Primary Chamber
Water Passage
Vacuum Lock Chamber
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Primary Chamber
Primary Valve and Seat
Primary Chamber
Primary Diaphragm Spring
Primary Diaphragm
Primary Valve Lever Spring
Primary Lever
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Secondary Chamber
Secondary Chamber
Secondary Valve and Seat
Secondary Valve Lever
Secondary Lever Spring
Diaphragm PinSecondary Diaphragm
Atmosphere Chamber
Balance Spring
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Vacuum Lock
Chamber
Vacuum Lock Chamber
Vacuum Lock Diaphragm
Diaphragm Spring
Primary Chamber
Secondary Chamber
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Carburetor and Mixer
Throttling Device. Creates Pressure Differential.
Blends Air and Fuel.
Multiple Fuel Capability. Gasoline and LPG Valves are Normally
Closed.
Shuts Off Fuel.
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Gasoline
Mode
Solenoid Energized
Float
Gasoline
Venturi Effect
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LPG ModeSolenoid Energized
From Vaporizer
Venturi Effect
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Mixer
Gaseous Propane from
Vaporizer
Venturi Effect
LPG Main Jet
Throttle Plate
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Propane Installation
Vaporizer must be mounted vertically.
Gaseous line must be 300mm +/- 20mm inlength. (11.8+/-.8)
Vaporizer, air needs to be bled from water
jacket after installation. All lines must be routed and secured to
avoid chaffing.
Vaporizer must be isolated from vibration.
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Propane Troubleshooting
No Start Fuel available.
Power to Solenoids.
Vacuum Source atVaporizer. 4(102mm)minimum.
Flooded. Disconnectvacuum line or unplugsolenoid to clear.
Look for Frost.
Throttle Plate Closed.
Low Power Shut Off Valves Fully
Open.
Look for Frost.
Check Vacuum Line for
Cracks or Restrictions.
Restricted Coolant Lines
to Vaporizer.
Atmosphere Port Blocked.
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Propane Troubleshooting
Engine Dies Fuel Available. Look for Frost.
Coolant to Vaporizer.
Power to Solenoids.
Vacuum to Vaporizer.
Atmosphere Port Blocked.
Engine Runs Rich Ruptured Primary orVacuum Lock Diaphragm.
Air Filter.
Gasoline Solenoid notClosing Properly.
Vaporizer Valves not
Seating Properly.
Cont..